I have the 7 resource accounts setup in their own OU (which i named Resources) at the root of our AD Forest.

I have added myself to the resource mailboxes as “owner” giving me all permissions. I have followed the steps in the article you sent but still no joy??

I have even given Anonymous and Default all permissions but im still getting the error message saying that no free/busy information is available whenever I try to schedule a meeting. I must have missed something but i just dont know what!